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Sound like the ISC actuator it part of the throttle body, and its a reversible motor, it maintains idle speed stability its a motor actuator,and is part of the throttle body but just dont condemd it sevice the throttle body this acuator motor sometime has a hard time moving to adjust RPM.Then there is the MAF(mass airflow sensor) even though this measures good or bad it does not set a code or Check engine light,
Here the most probable cause MAF they have problems on MBZ CLK 320 and only a fuel trim reading can detect problems with this sensor, dont be dependent on ck eng light it wont show, then there is the MAP manifold air pressure after coming to a stop sign the EGR may still be open and not close properly causing the stumble and this wont give a code. So here is the most probable cause the MAF mass air flow going out of range causing lean fuel trim or the EGR pintle not closing properly stumbing the vehicle , so I leave you with MAF or EGR either one or the other or both or just replace both
Your fuel system is a sealed system and part of the emission system also.If the gas cap is not tight or the seal has gone bad on the cap it will set a light.
I purchased a MB CLK 320 and set the radio frequency and successfully put the freq in memory, however, the radio blinks tthe freq. Is this normal or do I have to enter another key to stop the radio from blinking? Ed Massachusetts
Mercedes have purposely not put a transmission dipstick in their cars...to STOP any unauthorised persons from tampering with transmission fluid levels.
Electronic transmissions are extremely temperamental - if incorrect type, level is too low (or too high), this will accelerate premature wear and tear, not to mention erratic shifting behaviour.
For this reason, only Mercedes service agents have the required workshop tool (ie dipstick) which they insert into a tube in the transmission, to check levels.
If you happen to obtain the correct tool for your own use....please ensure you use only Mercedes specified fluids....and NEVER overfill the transmission case.
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